Washington Water Power Company. (1940). Accomplishment of the Washington Water Power Company in competition for the Charles A. Coffin Award.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWashington Water Power Company. Accomplishment of the Washington Water Power Company in Competition for the Charles A. Coffin Award. [Spokane, Wash, 1940.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWashington Water Power Company. Accomplishment of the Washington Water Power Company in Competition for the Charles A. Coffin Award. 1940.
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